Furnace



ugs. 24 9 Mm@ 195%7/19 v H. A. POPPENHUSEN FURNAGE Filed August 7, 1922 2 Sheets-Sheet 1 Aug. 24 1926.

H. A. POPPENHUSEN FURNACE Filed August v, 1922 2 sheets-Sheet 2 Patented Aug.. 24, 1926.

HERMAN A. -l?OPPlEhlHUSEIN', 0F HAMMOND, INDIANA, .ASSIGN'OR T0 GREEN ENGI- NEERING COMPANY, OF EAST CHICAGO, INDIANA, A CGRPORATION OF ILLINOIS.

FURNACE.

'application filed august 7, i922. serial No. 579,987.

This invention relates to furnaces equipped with mechanical stokers in the form of progressive feed grates. v

One object of my invention is to provide an effective combination of water cooled conduits at the sidesof the grate, water back pipes adjacent the rear of the grate, and an adjustable fuel retarder in the space between said grate and said water back pipes, this being accomplished by spacin g said pipes high enough above the grate to allow the conduits to pass-thereunder and having the ends of the retarder terminate short of said conduits.

Another object of my invention is to provide a novelv air seal for the spaces between the water back pipes, bridge wall overhang and the adjustable retarder and one that will be edective in all positions of adjust ment of the retarder and permit adjustment of the latter without breaking said'seal.

The invention consists in the matters hereinafter described and more particularly set forth in the annexed claims.

In the accompanying' drawings-P- Fig. 1 is a longitudinal vertical sectional view taken through a furnace embodying the features of myinvention;

Fig. 2 is a similar view on a large scale of the structure adjacent the rear discharge end of the grate;

Fig..3 is a transverse vertical sectional view taken on line 3-3 of Fig. 2;

Fig. 4 is a rear view of the furnace and showing the mechanism there, provided for adjusting thefuel retarder toward and from the grate: and

Fig. 5 is a perspective view of one end of the fuel retarder.

The furnace structure shown in Fig. 1, includes a mechanical stoker in the form of an endless lchain ate 1 which .extends through the front wall 2 of the furnace setting toward `the bridge wall 3 thereof. The rear or discharge end of the grate 1 terminates short of said bridge wall 3 to provide a vertical passage' for thel ash discharge over the rear end of said grate.

Extending alongthe sides of the grate 1 are pipes or conduits 4, 4. these are arranged in pairs at veach side of the upper lead 5 of the grate, as illustrated in Fig. 3 and are supported by the adjacent side walls 6. 6 of the furnace setting, as shown in said fig grate to impede the movement of the fuel bed.

In the arrangement shown, said conduits 4, 4 are water cooled by being included in the boiler circulation. This is accomplished by having waterboxes 7, 8 at. the ends of each set of conduits 4 and connecting these boxes by pipes 9, 9 with the front and rear headers 10, 11, respectively, of the water containing elements of the boiler.. The box 7 is at the inlet ends of its set of conduits 4, 4, while the box 8 is at outlet ends thereof. To facilitate the flow of steam bubbles occurring in the conduits 4, 4, they are inclined upwardly from the rear, as indicated in Fig. 1.

The bridge wall 3 hasan overhang12 extending over the rear or discharge end of the grate 1 above the same, as shown in Figs. 1 and 2. Arrangedl in this space are wat-er back pipes 13, 14. lSaid pipes 13, 14 are vertically' spaced apart and extend horizontally between the side walls 6, 6 of the furnace setting, as 'shown in Fig. 3. The ends of said pipes 13, 14 extend into said walls 6, 6 and are'connected together at'one end by a U or like fitting 15. The opposite ends of said pipes are connected with the headers 10 and 11, respectively, by pipes 16, 17 to place said pipes 13, 14 in boiler circulation, and maintain them relatively cool.

Fach set of side conduits 4, 4 pass under the water back pipes 13, 14 adjacent the side walls 6,6 of the furnace setting and continue on beyond the rear or tail end of the grate 1 through the bridge wall 3, as shown. To secure effective results, these conduits`4, 4 must extend substantially the full length of the grate in order to provide water cooled surfaces for the sides of the fire. This requires that 'the side pipes 4, 4 be at thev rear end of the grate and to accomplish that they must extend underthe icc pose.

water back pipes 13, 14. The result is that said water back pipes, to allow the side pei-pes 4, 4 to pass under them without bend, must be spaced or raised* above the upper lead 5 of the grate a distance suitable for that pur- As shown Vin the drawings, this is fulfilled by having both of the water back pipes 13, 14 above the uppermost of the side conduits 4, 4. The latter also need to extend rearwardly beyond the tail end of the grate 1 to have their rear ends accessible for connection with the rear header or other source of cooling water supply:

4, 4 to pass beneath the water back pipes,.

is of such height that the furnace could not be e'ectually operated without a fuel retarder in said space.

The fuel retarder which l have provided for this space comprises a pipe or conduit 18 extending transversely across the grate lead 5 substantially parallel with the water back pipes 13, 14 and below the same. The side pipes 4, 4 extending under the water back pipes 13, 14 makes it necessary to terminate the ends of the retarder pipe 18 short of the side pipes 4, 4 in order not to interfere with them and allow for vertical adjustment of said retarder pipe.

To maintain a circulation of cooling water .through saidretarder pipe 1:8 and also to provide for vertical adjustment of the same for regulating and controlling the discharge over the rear end of the grate 1, I provide the following` construction.

Secured 'to eachend of the retarder pipe 18 is a casting 19. These castings close the ends of said pipe, and each has two holes 20, 21 made in it, as shown in Fig. 5. These holes permit connections to be made with the ends of the pipe 18 for circulating cooling water through. When the connections are made the upper hole at one end `of the pipe constitutes the inlet and the lower hole at the opposite end of the pipejis the outlet. The vremaining two holes not used, one at each end of the'pipe, are closed by plugs 23` as indicated in Fig. 2` By having two holes in each casting -19v no attention need be paid to which ends of the pipe the castings are applied, as there is always an upper and a lower hole for the inlet and outlet, respectively. This, therefore, facilitates connecting up the retarder pipe 18 with the water supply when setting up the furnace as well as-when on a repair job. Pipes 24, 25 are connected with the inlet and outlet holes at the ends of the retarder pipe 18,

and have swing joints in their connections` with' the main inlet and outlet pipes in one of the side walls 6', as shown in Fig. 2. This allows the'pipes to move as the retarder pipe 18 is given vertical adjustment, and connects the retarder to the water service supl p 5Fach casting 19 has a rearwardly extending web 2G. These webs are secured to arms 27, 27 rockably mounted inbrackets 28 fixed to the bridge wall 3, as shown. These brackets are below the grate 1 and the arms 27, 27 extend upward and forward for connection with the webs 26, ,26, The arms 27,

27 rockably or pivotally mounted on the bridge wall 3 enables the retarder 18 to be moved or adjusted to and from the grate surface 5, and resists the end thrust of the fuel bed thereon.

To move the arms, provide at the rear ofthe bridge wall 3, a horizontal shaft 29. This is arranged above the grate 1, and is journaled in brackets 30, 30 on said wall. Fixed on said shaft 29 are two rack pinions 31, 31 one for each arm 27 andin alignment therewith. For each arm 27 is a rack bar 32 in mesh with the pinion for said arm. These bars extend through enlarged openings or channels 33 in the bridge wall 3 and are pi'voted to the respective arms 27, as shown.

The brackets 30 have side plates and the pinions 31 and bars 32 are arranged between with the bars resting on the pinions.` To hold the bars in mesh, each has a pin 34 with its ends in inclined slots 35 in the side plates of the associated brackets. These pins 34 also indicate by their positions in the slots 35 the extent to which the retarder 18 has been adjusted above the upper grate lead 5.

For rotating the shaft 29 and thus adjusting the retarder 18, there is a worm wheel bustion chamber from over the rear end of the grate. This plate extends downward to the lower pipe 14 and closes the space between the two pipes and also forms a backing for the fire clay or other heat resistant material 42 packed in said space.

To close the space between'the retarder 18 and the lower water back pipe 14 in all positions of vertical adjustment of the latter, I provide` an upright member or flange 43 on the retarder pipe 18, as shown. This flange extends upward and rearward to clear the lower water back pipe 14 'and contacts at its upper end at all times with-a plate 44 extending downward from the shield V41 and hinged or pivoted thereto, as shown.

As the retarder 18 is raised and lowered, the plate fifi moves with it and being incontact with the ange 43 seals the space between said plate to passage of cold air' into the combustion chamber from the rear of the grate.

The structure shown and described provides an effective and etiicient combination of side conduits, water back pipes, and adjustable fuel retarder, all water cooled to prevent the adherence of the fuel bed thereto and arranged and constructed in a manner giving the best furnace efficiency. rlhese parts are furthermore so associated that the arrangement of one is such that it accommodates and co-acts to the best results with the on i others.

lWhile ll have shown and described herein in detail a structure embodying the features of my invention, it is of course to be understood that the details of construction may be variously arranged and modified without departing from the spirit and scope of my invention.

l. The combination in al furnace, of a traveling grate discharging at its rear end, a water back pipe sp-aced above the grate and extending across the same adjacent its rear end, fluid cooled conduits extending along the sides of the grate and arranged to bein direct contact with the fuel bed thereon, said conduits extending under said pipe, and a fuel retarder vertically adjustable in the space between said grate and pipe and having its ends terminating short of said side conduits. .Y

2. The combination in a furnace, of a travelingr grate discharging at its rear end, a water back pipe spaced above the grate and extending across the same adjacent its rear end, iiuid cooled conduits extending along the sides of the grate and arranged to be in direct contact with the fuel bed thereon, said conduits extending under said pipe, a fuel retarder extending across the grate between said grate and pipe and having its ends terminating short of said side conduits, and means mounted on the furnace setting for supporting said retarder for vertical adjustment and for resisting the end thrust of the fuel bed thereon.

3,-The combination sin --a furnace, of a traveling grate discharging at its rear end, a water back pip'e spaced above the grate and extending across the same adjacent its rear end, iuid cooled conduits extending along the sides of the grate and arranged to be in direct contact with the fuel bed thereon, said conduits extending under said pipe, and a vertically adjustablewater cooled fuel retarder extending across the grate in the space between said grate and pipe and` having itsl ends terminating short of said side conduit-s, the latter and pipe being in boiler circulation and the retarder in the service supply without slotting the side walls of the furnace setting.

4. rilhe combination in a furnace having side walls, of a progressive feed grate therebetween, a fuel retarder having its ends ter` minating short of said side walls, curved arms to the rear of said retarder and having their upper. ends connected therewith, said arms at their lower ends having pivotal -connection with the furnace sett-ing to the rear of said grate, rock bars pivoted to Said arms and extending rearwardly therefrom, a shaft supported by said furnace setting 'to the rear of said arms and provided with pinions in mesh with said rack bars, and means for turning said shaft for adjusting the retarder toward and from said grate.

5. rlhe combination in a furnace having side walls and a bridge wall of a progressive feed grate between said walls and having it-s rear end terminating short of said bridge wall, a fuel retarder extending across the grate adjacent its rear end, said retarder having its ends terminating short of said `side walls, curved arms in the space between the rear end of the grate and .-said bridge wall, said arms having their upper ends connected to said retarder and their lower ends pivoted to said bridge wall below said grate, rack bars extending through said bridge wall in said openings` and connected with said arms, a shaft supported by said bridge wall and provided with pinions in mesh with said rack bars, and means for turning said shaft.

6. rPhe combination in a furnace having side walls and a bridge wall with an overhang, of a traveling grate between said side walls with its rear end terminating 'shortof said bridge wall under said overhang,` vertically spaced water back pipes beneath said overhang and extending across the grate adjacent its rear end, a vertically adjustable fuel retarder extending across the grate in the space. between the same and the lowermost pipe and having its ends terminating short of said side walls, a plate to the rear of said pipes and arranged to close the spaces between the same and said overhang, a second plate hinged to the rst platev and extending downward to the rear of the lowermost pipe, and an upwardly projecting plate on said retarder and engaging said second plate to keep closed the space between the lowermostpipe and said retarder in all positions of adjustment thereof.

7. The combination ina furnace having side walls, of a progressive feed grate therebetween, a vertically adjustable fuel retarder extending across said grate adjacent its discharge end, said retarder having its ends terminating short of said side walls, said retarderbeing in the form of a conduit, castings at the ends of said conduit to close the tending webs insie of said Walls, Water pipes Within said Wels endl connectect with said castinvs for circulating cooling Water through said retarder, curved arms 'to the rear of said retarder and connected with said Webs at one end, the other ends of said arms being pivoted to the furnace setting at the'reer of said grate, and means for edjusting said retarder toward and from the grate by moving said arms.

ln testimony that claim the foregoing as my invention, I aix my signature this 1st day of August, A. D. 1922.

HERMAN A. POPPENHUSEN. 

